Seth Rogen and Michelle Williams 'Waltz' For Sarah Polley

Sarah Polley has two people joining her on the dance floor for her latest directorial effort.

Deadline reports that the actor-director has cast both Seth Rogen and Michelle Williams in 'Take This Waltz,' a romantic triangle drama considered by many Hollywood insiders to be one of last year's best un-produced screenplays.

Written by Polley herself, 'Waltz' is her second feature film as director, following 2006's 'Away From Her,' which starred Julie Christie and Gordon Pinsent and earned Polley an Oscar nomination for Best Adapted Screenplay.